Troops/Landing Craft Relation

I know the title is confusing but i didnt knew what to call my question, with the Grenadier update the relation of Unite Size(Troop) with Troops Capacity(Lansing Craft), cant go further? Im asking because a landing Craft carrys max 24 units so:

Rifleman - 1 unitMax = 24 troops

Zooka - 2 unitMax = 12 troops

Warrior - 3 unitMax = 8 troops

Heavy - 4Max = 6 troops

Medic - 5 Max = 4 troops (although he only fills 20/24)

Grenadier - 6Max = 4 troops

? (future unit) - 7 (7x1=7, 7x2=14, 7x3=21)Max = 3 troops

21 (3 units) is max a landing Craft could carry a 7 unite size, will supercell think of adding another troop? Médico doenst fill every slot in LC so will there be another troop?